Abstract
The aim of this work is to study the characteristics of the electrodialysis of a sodium sulphate solution with experimental bipolar membranes based on the MA-41 anion exchange membrane and a liquid sulphonated cation-exchanger modified with bentonite clays. The conversion of sodium sulphate was conducted by electrodialysis with bipolar membranes obtained by applying a liquid sulphonated cation-exchanger containing particles of bentonite clay to the MA-41 anion-exchange membrane.To increase the performance of membranes in terms of hydrogen and hydroxyl ions, we carried out organomodifications of bentonite with alkyldimethylbenzylammonium chloride and stearic acid at various concentrations. The bipolar membrane with the addition of bentonite modified with alkyldimethylbenzylammonium chloride (2 wt%) showed a higher performance in terms of H+-ions. The bipolar membrane with bentonite modified with stearic acid (3 wt%) added to its cation-exchangelayer is the most effective in terms of obtaining a flux of OH--ions. It was shown that a combination ofalkyldimethylbenzylammonium chloride (2 wt%) and stearic acid (3 wt%) used to modify bentonite can increase the performance of the bipolar membrane during the conversion of sodium sulphate, both in terms of the acid and alkali.
Highlights
The efficiency of electrodialysis used for the conversion of salt solutions largely depends on the properties of the membranes applied in the process [1]
We investigated bipolar membranes obtained by applying on the anionexchange membrane a liquid cation exchanger that did not contain bentonite (MBex), as well as a cation exchanger with the addition of the following amount of bentonite (% to the mass of the cation exchanger): 1 (MBBT1), 2 (MBBT2), and 3 (MBBT3)
Further studies were aimed at studying the possibility of improving the characteristics of experimental membrane samples by changing the properties of bentonite by the organomodification of SAS (MBSAS1, MBSAS2, MBSAS3) and stearic acid (MBSt1, MBSt2, MBSt3)
Summary
The efficiency of electrodialysis used for the conversion of salt solutions largely depends on the properties of the membranes applied in the process [1]. The use of clays for polyvinylidene fluoride (PVDF) membranes has been studied [22,23,24,25,26,27,28,29,30,31,32]. Adding cloisite and palygorskite improves the mechanical properties of such membranes and increases their resistance to surface abrasion. PVDF membranes modified with montmorillonite (MMT) have been developed. They have a higher degree of selectivity in dye filtration [33]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call